Results 261 to 270 of about 22,757,743 (311)
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Regioselective N-Functionalization of Tetraazacycloalkanes
The Journal of Organic Chemistry, 2005[reaction: see text] Bisaminal type compounds obtained by condensation of pyruvic aldehyde with the suitable open-chain tetraamine followed by cyclization with either dibromoethane or dibromopropane can be regioselectively quaternized by a wide range of alkylating agents.
Frédéric, Boschetti +5 more
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N-Functions and integration by substitution
Rendiconti del Seminario Matematico e Fisico di Milano, 1977By use of a new result concerning the validity of the chain rule for the derivative of a composite function, the author succeeds in extending the classical change of variable formula for Lebesgue and Denjoy/Perron integrals to the case in which the change is effected by continuousN-functions of unbounded variation. A novelty of the resulting formula is
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Mathematical Notes of the Academy of Sciences of the USSR, 1968
We consider three classes of N-functions: (Δ'), the class of functions satisfying the Δ' condition, (Δ2), the class of functions satisfying the Δ2 condition, and (MΔ), the class of functions M(u) satisfying the condition:\(\mathop {\lim }\limits_{u \to \infty }\) ln M (u) / ln u = p < ∞.
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We consider three classes of N-functions: (Δ'), the class of functions satisfying the Δ' condition, (Δ2), the class of functions satisfying the Δ2 condition, and (MΔ), the class of functions M(u) satisfying the condition:\(\mathop {\lim }\limits_{u \to \infty }\) ln M (u) / ln u = p < ∞.
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Superbasic properties of the SN functional group
Journal of Physical Organic Chemistry, 2002AbstractQuantum‐chemical calculations (ab initio and semiempirical) were performed for neutral and monoprotonated model compounds of general formula H iXNH (where X is C, N, S or P and i = 1, 2 or 3) and thermodynamic parameters for the protonation reaction were calculated. All derivatives belong to the family of nitrogen bases. The basicity of H2SNH
Ewa Raczyńska +3 more
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Cation-Directed Enantioselective N-Functionalization of Pyrroles
Synlett, 2015A catalytic enantioselective N-functionalization of pyrroles has been developed. Imines formed in situ via condensation underwent cation-directed cyclization with complete N-regioselectivity. The cyclized products were obtained with enantiomeric ratios up to 96:4 for aldimine substrates and up to 99:1 for trifluoromethyl ketimines.
Armstrong RJ, DAscenzio M, Smith MD
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Integral representations and transforms of N-functions. II
Siberian Mathematical Journal, 2006Summary: We develop some mathematical method that enables us to prove extrapolation theorems for arbitrary behavior of an operator in the Lebesgue scale (i.e., in the case when the norm of the operator is an arbitrary function of \(p\)) and also in the case when the basic scale is an interval of the Lebesgue scale with exponents separated from 1 or \(+\
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2016
Objective: This exercise demonstrates how to use the Top N function to determine top performers.
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Objective: This exercise demonstrates how to use the Top N function to determine top performers.
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Electrogenerated N-heterocyclic carbenes: N-functionalization of benzoxazolones
Tetrahedron, 2009A simple electrochemical procedure for the N-acylation and N-alkylation of benzoxazol-2(3H)-ones has been set up via electrolysis of an ionic liquid containing a benzoxazolone followed by addition of saturated or unsaturated anhydrides or alkyl halides.
CHIAROTTO, Isabella +4 more
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Synthesis and characterization of N-functionalized enetetramines, and their properties:
2004Two general routes are described for the synthesis of the title compounds from the reaction of, either the dimethyl acetal of N,N'-dimethylformamide and an appropriate N, N'bis(secondary amine), or sodium hydride (or potassium tert-butoxide) and 4,5-dihydroimidazolium salts.
Gok, Y +4 more
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ChemInform Abstract: N‐Functionalized Organocuprates
ChemInform, 2010AbstractReview: 260 refs.
R. Karl Dieter, Rhett T. Watson
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